I agree with Jack, send the Galazan gage back and use the Skeet's gage. In doing the choke, to me it is easier that once the indicator is zeroed to the .700 ring, insert into barrel, read bore size to full length (11 1/2" on mine) and then reset to zero and with-draw and read choke. Easy to see what difference there is.(Bill doesn't approve of this method)
Also the Skeet's will measure 16 ga. But if you do not have a ring gage to go by it is easy to get confused by subtracting the bores form the dial. Also some earlier 16 ga. were .650 bore and later were .662. I know this is true for L.C. Smith's but not sure of others.
In measuring the .650 bores will be tough because the brass head is .625 and so the balls are almost into the head and will not fit into the bore with any choke.
